//使用clock得到一个程序大致的运行时间。
#include<stdio.h>
#include<time.h>
int main(void)
{
	double t1, t2;
	t1 = clock();
	printf("%lf\n", t1);
	int circul = 0;
	for (circul = 0; circul <= 100; circul++)
	{
		printf("%d\n", circul * circul);
	}
	t2 = clock();
	printf("%lf\n", t2);
	printf("%lf\n", (t2 - t1) / CLOCKS_PER_SEC);
	return 0;
}